<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
    <script type="text/javascript">
		function foo(e) {
			console.log(e);
			console.log(e.button);
			console.log(e.clientX+", "+e.clientY);
		}
		document.onmousedown = foo;
	</script>

	</body>
</html>